County annual report · FIPS 19029
2021 Cass County, IA Power Outage Report
In 2021, customers in Cass County, IA went without power for an average of 1.6 hours, a total of 16K customer-hours (Iowa average 2.7 hours). That ranks 78th worst of 99 Iowa counties and 2437th of 2,974 nationally.
Compared with IA, the US and 2020
Coverage line is EAGLE-I's share of Iowa customers tracked each year.
Biggest outages in Cass County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 15, 2021 22:45 | December 18, 2021 03:15 | 2d 4h | 1,135 | 6,005 |
| 2 | December 1, 2021 15:15 | December 1, 2021 16:15 | 1h | 967 | 726 |
| 3 | June 14, 2021 16:45 | June 18, 2021 17:45 | 4d 1h | 637 | 423 |
| 4 | June 30, 2021 19:00 | June 30, 2021 19:15 | 15m | 636 | 159 |
| 5 | July 13, 2021 20:00 | July 13, 2021 20:15 | 15m | 636 | 159 |
| 6 | September 30, 2021 09:15 | October 7, 2021 18:15 | 7d 9h | 416 | 1,484 |
| 7 | July 31, 2021 02:15 | July 31, 2021 14:30 | 12h 15m | 324 | 2,972 |
| 8 | December 18, 2021 16:30 | December 18, 2021 20:45 | 4h 15m | 147 | 261 |
| 9 | June 19, 2021 04:30 | June 21, 2021 18:15 | 2d 13h | 115 | 1,592 |
| 10 | August 31, 2021 04:30 | August 31, 2021 13:00 | 8h 30m | 106 | 311 |
Outage episodes by size in 2021: 10 reached 100+ customers, 1 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Cass County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| MidAmerican Energy Co | 2021 | 1.9 hrs | 1.04 | 75 min | 0.74 |
| Southwest Iowa Rural Elec Coop | 2018 | 2.4 hrs | 1.69 | 1.6 hrs | 1.21 |
| Farmers Electric Coop, Inc - (IA) | 2018 | 5.9 hrs | 1.44 | 2.1 hrs | 1.26 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Interstate Power and Light Co | - | - | - | - | - |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Waverly Municipal Elec Utility | - | - | - | - | - |
| Guthrie County Rural E C A | - | - | - | - | - |
| Nishnabotna Valley R E C | - | - | - | - | - |
| Atlantic Municipal Utilities | - | - | - | - | - |
| City of Anita - (IA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of Iowa's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 10,329 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Cass County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cass County, IA annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/iowa/cass-county